Efficient real-time data acquisition of wired sensor network with line topology

Abstract

In this paper a method for efficient data acquisition from sensor network with large number of nodes is proposed. A specific design allows simple device connection in daisy-chain configuration, thus removing addressing problems and allowing synchronized sampling design using just 4 wires. Several limitations are considered to provide mathematical model for estimation of maximum number of sensor nodes. An experimental setup was designed which demonstrated theoretical ability to acquire data from up to 200 sensors with 50 Hz sampling rate using conventional low-cost hardware, however, more advanced setup could allow to increase maximum number of sensors several times. The wiring structure of the network as well as hardware is specifically designed for use in smart garments or similar applications that require sensor integration in compact environment and low-power, real-time performance.

Smart textiles for wearable sensor networks: Review and early lessons

“…The current smart textile prototype contains 63 sensor nodes connected in a line topology [29] with four wires from one node to the next (Fig. 2).…”

Wearable Sensor Clothing for Body Movement Measurement during Physical Activities in Healthcare

“…In each branch, sensor nodes are connected in enhanced serial peripheral interface (SPI) daisy-chain configuration, supporting baud rates up to several megahertz without data overhead for device addressing. It provides relatively fast data transfer speeds (200 sensor nodes at 50 Hz), which are feasible for real-time applications [ 16 ].…”

A Multifunctional Integrated Circuit Router for Body Area Network Wearable Systems

“…In [17], a circuit for efficient data acquisition from sensor networks with a large number of nodes is proposed. The design allows for simple device connections in a daisy-chain SPI network configuration.…”

“…The systems presented in [13], [31], [33], [36] include only a few sensors. In contrast, those proposed in [17], [21], [26] are capable of supporting more sensors but in practice they may not exceed several tens of sensors due to the increased load on the communication line which reduces the communication speed and increases the power consumption as well. The circuit presented in this article can support up to hundreds of sensors without slowing down the communication speed.…”